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Ye C.-D.,Changzhou University | Long D.,Changzhou University | Kong D.-J.,Changzhou University | Kong D.-J.,Jiangsu Provincial Engineering Research Center for Digital Design and Manufacturing of Chain Transmission | And 2 more authors.
Sichuan Daxue Xuebao (Gongcheng Kexue Ban)/Journal of Sichuan University (Engineering Science Edition) | Year: 2013

The TiN and AlTiN coatings were prepared on Cr12MoV steel substrate by physical vapor deposition (PVD) method, the morphologies, phase and bonding strength of the coating surface and interface were analyzed by SEM, XRD and scratching tester, respectively, and the friction-wear test of the coating was processed. The results showed that TiN and AlTiN coatings have higher hardness, the surface roughness of the AlTiN coating is better than that of the TiN coating, the average deviation of the surface profile arithmetic Ra of TiN coating is 328.91 nm, while that of AlTiN coating is 112.49 nm. Binding strength of TiN coating is 28.8 N, and that of AlTiN coating is only 15.05 N. Friction coefficient of AlTiN coating is slightly higher than that of TiN coating in running-in period and fluctuation period, and friction coefficients of the two coatings are almost same in the stable period, which maintains at about 0.44~0.46.Compared with TiN coating, the toughness and wear performance of AlTiN coating are improved. Source


Wang W.-C.,Changzhou University | Zhang L.,Changzhou University | Kong D.-J.,Changzhou University | Kong D.-J.,Jiangsu Provincial Engineering Research Center for Digital Design and Manufacturing of Chain Transmission | And 2 more authors.
Jianzhu Cailiao Xuebao/Journal of Building Materials | Year: 2013

The amorphous Ni-P coating was prepared on the surface of ZL113 aluminum alloy by chemical plating, the coating was heat treated at 350°C for 20-140 min. The effects of heat treatment time on the surface morphologies, chemical element content and crystallization of phase composition of the coating were characterized with SEM, EDS and XRD, respectively, the hardness change rule of the coating was analyzed, and the wear resistance of heat treatment was examined. The results show that the chemical plating Ni-P alloy coating structure recombination were made by heat treatment, and improvement of Ni-P microhardness is mainly due to the formation of the mixture phase of Ni-Ni3P, and Ni3P. The coating hardness shows a trend of increasing at first and then decreasing with heating time, it has a normal distribution, and reaches the maximum at 60 min. The heat treatment time has little effect on friction coefficient; the wear resistance of the Ni-P coating is obviously higher than the primitive state, the best of wear resistance appears under 60 min heat processing, wear process is manifested as abrasive wear. Source


Wu Y.-Z.,Changzhou University | Kong D.-J.,Changzhou University | Kong D.-J.,Jiangsu Provincial Engineering Research Center for Digital Design and Manufacturing of Chain Transmission | Wang W.-C.,Changzhou University | And 3 more authors.
Cailiao Kexue yu Gongyi/Material Science and Technology | Year: 2013

To improve the corrosion resistance of aluminum alloy, amorphous Ni-P coating was prepared on the surface of 5052 aluminum alloy by chemical plating, and the coating surface and interface morphologies, chemical elements and phase compositions before and after salt spray corrosion were characterized by SEM, EDS and XRD, respectively. The failure mechanism of Ni-P coating in salt spray corrosion was researched. The results show that the Ni-P coating by chemical plating is an amorphous state, forming by the particles of diameter 10~50 μ m, which are evenly distributed, and the interface combines well. The Ni-P coating is the high-P, and its phases are mainly simple substance Ni and Ni-P alloy. After salt spray corrosion, the whole corrosion-resistance of Ni-P coating surface is better, the local phenomenon of corrosion pits and coating peeling are caused by the original defects of chemical plating. Source

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